The phrase "opening minutes" refers to the initial moments or beginning of a specific event, such as a game, movie, or presentation. It usually describes the first few minutes of something when it starts. Full definition
With this week's market open minutes away we will find out if conviction has returned via volume / relative volume throughout the week. (blackarbs.com)
There is a lot of plot to get through and the first opening minutes really need to be slowed down. (oracleoffilm.com)
The film's opening minutes throw you for a loop. (dvdizzy.com)